1990s
As far as Japanese academics are concerned, the controversy over the occurrence of atrocities ended in the early '90s. Both sides accept that atrocities did occur; however, disagreement exists over the actual numbers. The debate is focused on the questons of whether to include archival or anecdotal evidence, what time period to use in defining the massacre, and what geographical area to use in defining the massacre.
Read more about this topic: Historiography Of The Nanking Massacre